VGA White light on my Asus z390 e Mobo

Hi guys i had this strange thing happen to me, no idea how i turned my pc on it booted normally and all was well and then i started playing NFS game rand fine no crahses had about 2 hour game and then i closed the game everything was fine and then i look inside the window of my pc and i see the white LED i looked at the manual it said that refers to the GPU but nothing crashed no crash logs nothing, I am confused is this a one of or a bug or something else?